1.
How many significant figures does the following number have?
305500
Correct Answer
B. 4
Explanation
The number 305500 has four significant figures. Significant figures are the digits that carry meaning in a number and indicate its precision. In this case, all the non-zero digits (3, 0, 5, and 5) are significant, and the trailing zeros are also not significant. Therefore, the number has a total of four significant figures.
2.
How many significant figures does the following number have?
4.57 x 10^7
Correct Answer
C. 3
Explanation
The given number, 4.57 x 10^7, is written in scientific notation. In scientific notation, the coefficient is written as a number between 1 and 10, and the exponent indicates the power of 10. The significant figures are the digits that carry meaning in a number. In this case, the coefficient 4.57 has three significant figures: 4, 5, and 7. The exponent does not affect the number of significant figures. Therefore, the correct answer is 3.
3.
How many significant figures does the following number have?
0.00056006
Correct Answer
A. 5
Explanation
The given number, 0.00056006, has 5 significant figures. Significant figures are the digits in a number that carry meaning in terms of its precision. In this case, all the digits from the first non-zero digit (5) to the last non-zero digit (6) are significant. The zeros at the beginning and end of the number are not significant as they are only placeholders. Therefore, the number has a total of 5 significant figures.
4.
How many significant figures does the following number have?
930000000000
Correct Answer
C. 2
Explanation
The given number, 930000000000, has two significant figures. Significant figures are the digits in a number that carry meaning and contribute to its precision. In this case, the zeros at the end of the number are not considered significant because they only indicate the magnitude or scale of the number. Therefore, the significant figures in this number are 9 and 3.
5.
How many significant figures does the following number have?
5.48008
Correct Answer
A. 6
Explanation
The number 5.48008 has six significant figures. Significant figures are the digits in a number that carry meaning in terms of its precision. In this case, all the digits, including the trailing zeros after the decimal point, are considered significant because they provide information about the accuracy of the measurement. Therefore, the number has a total of six significant figures.
6.
How many significant figures does the following number have?
1.00
Correct Answer
C. 3
Explanation
The number 1.00 has three significant figures. The zeros at the beginning and end of the number are considered significant because they are between nonzero digits. The decimal point does not affect the significant figures.
7.
How many significant figures does the following number have?
100
Correct Answer
C. 1
Explanation
The number 100 has only one significant figure because trailing zeros are not considered significant unless there is a decimal point explicitly shown. In this case, there is no decimal point, so only the non-zero digit (1) is considered significant.
8.
Calculate the answer to the correct number of significant figures?
42 x 5
Correct Answer
B. 200
Explanation
The product of 42 and 5 is 210. However, since the number 5 only has one significant figure, the answer should be rounded to one significant figure as well. When rounding to one significant figure, any number greater than or equal to 5 should be rounded up, and any number less than 5 should be rounded down. Therefore, the correct answer is 200.
9.
Calculate the answer to the correct number of significant figures.
54.44 + 45.5
Correct Answer
B. 99.9
Explanation
When adding or subtracting numbers, the result should be rounded to the same number of decimal places as the number with the fewest decimal places. In this case, both numbers have one decimal place. When we add 54.44 and 45.5, the result is 99.94. Since 99.94 has two decimal places, we round it to one decimal place, which gives us 99.9. Therefore, the correct answer is 99.9.
10.
Calculate the answer to the correct number of significant figures.
405 / 50
Correct Answer
A. 8
Explanation
The division of 405 by 50 gives a quotient of 8.1. Since the original numbers have three significant figures (405) and two significant figures (50), the answer should have two significant figures as well. Therefore, the correct answer is 8.1.
11.
Calculate the answer to the correct number of significant figures.
(4.00 x 10^7) x (5.34 x 10^5)
Correct Answer
B. 21.4 x 10^12
Explanation
The given expression is a multiplication of two numbers in scientific notation. To calculate the answer, we multiply the two numbers together and add their exponents.
(4.00 x 10^7) x (5.34 x 10^5) = (4.00 x 5.34) x (10^7 x 10^5) = 21.36 x 10^12
The answer is 21.36 x 10^12. However, since we need to express the answer to the correct number of significant figures, we round it to one decimal place, resulting in 21.4 x 10^12.
12.
Calculate the answer to the correct number of significant figures.
(7.4 x 10^-3) / (6.77 x 10^4)
Correct Answer
B. 50 x 10^-7
Explanation
The given expression is (7.4 x 10^-3) / (6.77 x 10^4). When dividing two numbers, the rule for significant figures is to have the same number of significant figures as the number with the fewest significant figures. In this case, the number with the fewest significant figures is 7.4 x 10^-3, which has two significant figures. Therefore, the answer should also have two significant figures. Since 50 x 10^-7 has two significant figures, it is the correct answer.
13.
Convert the following number into correct scientific notation:
6700000
Correct Answer
A. 6.7 x 10^6
Explanation
The given number, 6700000, can be converted into scientific notation by moving the decimal point to the left until there is only one non-zero digit to the left of the decimal point. In this case, the decimal point is moved 6 places to the left, resulting in the number 6.7. The exponent is determined by the number of places the decimal point was moved, which is 6. Therefore, the correct scientific notation for 6700000 is 6.7 x 10^6.
14.
Convert the following number into correct scientific notation:
0.0000000567
Correct Answer
B. 5.67 x 10^-8
Explanation
The given number, 0.0000000567, can be expressed in scientific notation as 5.67 x 10^-8. In scientific notation, a number is written as a decimal between 1 and 10 multiplied by a power of 10. In this case, the decimal part is 5.67, and the power of 10 is -8, indicating that the decimal point needs to be moved 8 places to the left to obtain the original number. Therefore, 5.67 x 10^-8 is the correct scientific notation for 0.0000000567.
15.
Correct the following number that is in scientific notation to a normal number:
4.75 x 10^-4
Correct Answer
B. 0.000475
Explanation
The given number in scientific notation, 4.75 x 10^-4, can be converted to a normal number by moving the decimal point four places to the left. This gives us 0.000475. Therefore, the correct answer is 0.000475.
16.
Correct the following number that is in scientific notation to a normal number:
5.678 x 10^7
Correct Answer
C. 56780000
Explanation
The given number is in scientific notation, where 5.678 is multiplied by 10 raised to the power of 7. To convert it to a normal number, we need to move the decimal point 7 places to the right, resulting in 56,780,000. Therefore, the correct answer is 56,780,000.